Johnson County Auditor Travis Weipert says he's frustrated by talk of a "rigged election," which has been widely circulated by GOP nominee Donald Trump.

"If you look at all the facts, it has been almost proven that any voter fraud has been proven non-existent in Iowa," Weipert said Tuesday morning. "I don't understand why the candidates and campaigns are going after us...Let us run the elections, that's why we are elected."

Iowa Gov. Terry Branstad has supported Trump's claim that the election is rigged and media organizations are intentionally helping Democrat Hillary Clinton. Branstad said he agrees with Trump that there are efforts to cheat the system and that national media organizations are "colluding" with Clinton, the Associated Press reported Monday.

Iowa Secretary of State Paul Pate has also refuted claims of a rigged election.